Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff04cb36156dcf39…

MALICIOUS

PDF

92.1 KB Created: 2021-10-07 11:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 265b5d451f10c24b839f1e94ff3ce269 SHA-1: db6140e5ed264126e0c8d32f179a6de566af8f4c SHA-256: ff04cb36156dcf396bc9584f4fb6006cb67614e9607c5dd3f13651ae404f7bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=spring+boot+tutorial+for+beginners+pdf PDF link annotation
    • http://konakelektrik.com/userfiles/file/35751944065.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/bonaxuvijid.pdfIn PDF document text
    • https://laps.pl/userfiles/file/reponezazinesawezufodajo.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/kaweso.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25605632576.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/mazededaxe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7259ca2326205c4fa2da58fd1faf9980/7979331507.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/44394019171.pdfIn PDF document text
    • https://satesayap.com/contents/files/fimam.pdfIn PDF document text
    • http://blueyee.com/upload/file/211004009514.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7650bc5b6---40144900888.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/91084759232.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109050422575910.pdfIn PDF document text
    • https://dacola.com/upload/files/61709700435.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161521358278b4---donagikofewoginiwawogemi.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/45520783867.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sadovanixetuzamibekoxow.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/94224634113.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1b9ce5d2a9f2004e4071db78c0b22896/2581898976.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/xotezufafev.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/74860564561.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/4845487247.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ridipatosotem.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/sisib.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10988 bytes
SHA-256: cd2e20d27fe4c755f9c51a0eb7f75a96329abcda070220cbeb0ca21552428344
font_01_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 19564 bytes
SHA-256: 10dc63e5718b21ea8459bba336e9fe8451865c6715eaf0337d5ab126f8283de1